/* =====================================================================
   Set Lonnert — Humanistics & Technology
   Shared stylesheet for index.html and code-crafting.html.
   Extracted from index.html so the two pages cannot drift apart.
   ===================================================================== */

:root {
    --bg-primary: #fafaf8;
    --bg-secondary: #f0ede6;
    --text-primary: #1a1814;
    --text-secondary: #5a5550;
    --accent: #c42836;
    --accent-soft: #db5a65;
    --border: #d4cfc5;
    --highlight: #fff5f6;
    --red-tint: rgba(196, 40, 54, 0.03);
    --fpw: 320px;
    --fph: 453px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Crimson Pro', serif;
    background: linear-gradient(180deg, var(--bg-primary) 0%, #faf8f8 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animated grain texture */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: 1;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    animation: grain 8s steps(10) infinite;
}

@keyframes grain {
    0%, 100% { transform: translate(0, 0); }
    10% { transform: translate(-5%, -10%); }
    20% { transform: translate(-15%, 5%); }
    30% { transform: translate(7%, -25%); }
    40% { transform: translate(-5%, 25%); }
    50% { transform: translate(-15%, 10%); }
    60% { transform: translate(15%, 0%); }
    70% { transform: translate(0%, 15%); }
    80% { transform: translate(3%, 35%); }
    90% { transform: translate(-10%, 10%); }
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 2;
}

/* Header */
header {
    padding: 3rem 0 2rem;
    border-bottom: 1px solid var(--border);
    animation: slideDown 0.8s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.site-title {
    font-family: 'Fraunces', serif;
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 300;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 0.5rem;
    font-variation-settings: "opsz" 144;
}

.site-title .ampersand {
    font-style: italic;
    color: var(--accent);
    font-weight: 400;
}

.site-subtitle {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    animation: fadeIn 1s ease-out 0.3s both;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-image {
    position: relative;
    aspect-ratio: 3/4;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(20%) contrast(1.05);
    transition: transform 0.6s ease;
}

.hero-image:hover img {
    transform: scale(1.03);
}

.hero-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(196, 40, 54, 0.12) 0%, transparent 50%);
    pointer-events: none;
}

.hero-image-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.52) 0%, transparent 100%);
    padding: 1.4rem;
    pointer-events: none;
}

.hero-image-caption span {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #fafaf8;
}

.hero-content {
    padding-top: 2rem;
}

.intro-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 2rem;
    display: inline-block;
    padding: 0.4rem 1rem;
    background: var(--highlight);
    border-left: 3px solid var(--accent);
}

.intro-text {
    font-size: clamp(1.1rem, 2vw, 1.3rem);
    line-height: 1.8;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.intro-text strong {
    font-weight: 600;
    color: var(--accent);
}

.timeline-note {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-left: 3px solid var(--border);
    margin: 2rem 0;
    font-weight: 300;
}

/* Featured Work */
.featured {
    padding: 5rem 0;
    border-top: 1px solid var(--border);
    animation: fadeIn 1s ease-out 0.6s both;
}

.section-header {
    font-family: 'Fraunces', serif;
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 300;
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
    font-variation-settings: "opsz" 120;
}

.featured-group-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.8rem;
    font-weight: 400;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin: 3.5rem 0 1.75rem;
    display: flex;
    align-items: center;
    gap: 1.2rem;
}

.featured-group-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.featured-group-label:first-of-type {
    margin-top: 0;
}

.featured-book {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 3rem;
    padding: 3rem;
    background: linear-gradient(135deg, var(--highlight) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--border);
    position: relative;
    transition: transform 0.3s ease;
    box-shadow: 0 0 0 0 rgba(196, 40, 54, 0);
}

.featured-book:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(196, 40, 54, 0.08);
}

.featured-book::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: var(--accent);
}

.book-cover {
    border: 1px solid var(--border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    overflow: hidden;
    position: relative;
    cursor: pointer;
}

.book-cover img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

.book-cover:hover img {
    transform: scale(1.03);
}

.book-cover-hint {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.58) 0%, transparent 55%);
    display: flex;
    align-items: flex-end;
    padding: 1.4rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.book-cover:hover .book-cover-hint {
    opacity: 1;
}

.book-cover-hint span {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #fafaf8;
}

/* ── Flipbook modal ── */
.flip-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9000;
    background: rgba(8,6,4,0.90);
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.flip-modal.open { display: flex; }

.flip-inner {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
    max-width: 100%;
}

.flip-close {
    position: absolute;
    top: -2.6rem;
    right: 0;
    background: none;
    border: 1px solid rgba(255,255,255,0.22);
    color: rgba(255,255,255,0.65);
    font-size: 1.1rem;
    line-height: 1;
    padding: 0.3rem 0.8rem;
    cursor: pointer;
    font-family: 'IBM Plex Mono', monospace;
    transition: border-color 0.2s, color 0.2s;
}

.flip-close:hover { border-color: var(--accent-soft); color: #fafaf8; }

.flip-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 3rem 4rem;
}

.flip-prog-track {
    width: 220px;
    height: 2px;
    background: rgba(255,255,255,0.12);
    overflow: hidden;
}

.flip-prog-bar {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.25s ease;
}

.flip-loading-msg {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.73rem;
    color: rgba(255,255,255,0.45);
    letter-spacing: 0.08em;
}

.flip-book-wrap {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: 1.2rem;
}

.flip-spread {
    display: flex;
    position: relative;
    box-shadow: 0 40px 80px rgba(0,0,0,0.55);
}

.flip-page {
    width: var(--fpw);
    height: var(--fph);
    overflow: hidden;
    background: #fefefc;
    position: relative;
    flex-shrink: 0;
}

.flip-page img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.flip-pl { box-shadow: inset -5px 0 16px rgba(0,0,0,0.08); }
.flip-pr { box-shadow: inset  5px 0 16px rgba(0,0,0,0.08); }
.flip-blank { background: linear-gradient(110deg, #f4f0e8 0%, #e8e2d4 100%); }

.flip-spine {
    width: 10px;
    flex-shrink: 0;
    background: linear-gradient(90deg, #7a6a50 0%, #b89a68 45%, #7a6a50 100%);
    box-shadow: 0 0 10px rgba(0,0,0,0.4);
}

.flip-pnum {
    position: absolute;
    bottom: 9px;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.62rem;
    color: #bbb;
    pointer-events: none;
}

.flip-pl .flip-pnum { left: 12px; }
.flip-pr .flip-pnum { right: 12px; }

.flip-leaf {
    position: absolute;
    top: 0;
    height: var(--fph);
    transform-style: preserve-3d;
    pointer-events: none;
    z-index: 20;
    will-change: transform;
}

.flip-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    overflow: hidden;
    background: #fefefc;
}

.flip-face img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.flip-face-back { transform: rotateY(180deg); }

.flip-shade {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 15;
    opacity: 0;
    transition: opacity 0.35s ease;
}

.flip-controls {
    display: flex;
    align-items: center;
    gap: 1.6rem;
}

.flip-nav {
    background: none;
    border: 1px solid rgba(255,255,255,0.18);
    padding: 0.5rem 1.2rem;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.73rem;
    letter-spacing: 0.06em;
    cursor: pointer;
    color: rgba(255,255,255,0.7);
    transition: border-color 0.2s, color 0.2s;
}

.flip-nav:hover:not(:disabled) { border-color: var(--accent-soft); color: #fafaf8; }
.flip-nav:disabled { opacity: 0.22; cursor: not-allowed; }

.flip-info {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.7rem;
    color: rgba(255,255,255,0.38);
    min-width: 110px;
    text-align: center;
}

@media (max-width: 580px) {
    .flip-pl, .flip-spine { display: none !important; }
}

.book-cover-wrap {
    position: relative;
}

.coming-soon-badge {
    position: absolute;
    top: -1rem;
    right: -1rem;
    z-index: 10;
    background: var(--accent);
    color: #fafaf8;
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.45rem 0.9rem;
    box-shadow: 0 4px 16px rgba(196, 40, 54, 0.35);
}

/* A softer, earlier-stage badge — weaker than "Coming Soon":
   not yet announced or submitted, still being written. */
.draft-badge {
    position: absolute;
    top: -1rem;
    right: -1rem;
    z-index: 10;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px dashed var(--border);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.68rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    padding: 0.45rem 0.9rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.book-details h3 {
    font-family: 'Fraunces', serif;
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 1rem;
    color: var(--accent);
}

.book-details p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
}

.book-details a {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

.book-details a:hover {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}

/* Companion note bridging the two AI books */
.diptych-note {
    max-width: 760px;
    margin: 3rem auto;
    padding: 2rem 2.5rem;
    text-align: center;
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    background: var(--red-tint);
}

.diptych-note .diptych-label {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 1.5rem;
    display: block;
}

.diptych-note p {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.diptych-note p:last-child {
    margin-bottom: 0;
}

.diptych-note em {
    font-style: italic;
    color: var(--text-primary);
}

/* Philosophy Section */
.philosophy {
    padding: 5rem 0;
    border-top: 1px solid var(--border);
    animation: fadeIn 1s ease-out 0.9s both;
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.philosophy-card {
    padding: 2rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
    position: relative;
}

.philosophy-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.philosophy-card:hover::before {
    transform: scaleX(1);
}

.philosophy-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(196, 40, 54, 0.1);
    background: linear-gradient(135deg, var(--highlight) 0%, var(--bg-secondary) 100%);
}

.philosophy-card h3 {
    font-family: 'Fraunces', serif;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
    color: var(--accent);
}

.philosophy-card p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Footer */
footer {
    padding: 4rem 0 3rem;
    border-top: 1px solid var(--border);
    margin-top: 5rem;
    animation: fadeIn 1s ease-out 1.2s both;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-brand {
    flex: 1;
    min-width: 250px;
}

.footer-brand h4 {
    font-family: 'Fraunces', serif;
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
}

.footer-brand p {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.footer-links {
    display: flex;
    gap: 3rem;
}

.footer-column h5 {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.footer-column a {
    display: block;
    font-size: 0.95rem;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--accent);
}

.copyright {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .featured-book {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .book-cover {
        max-width: 300px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    header {
        padding: 2rem 0 1.5rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .featured, .philosophy {
        padding: 3rem 0;
    }

    .philosophy-grid {
        grid-template-columns: 1fr;
    }

    .footer-links {
        flex-direction: column;
        gap: 2rem;
    }
}

/* Scroll-triggered animations */
.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}


/* =====================================================================
   Cross-page navigation
   ===================================================================== */

.site-nav {
    display: flex;
    gap: 2rem;
    margin-top: 1.75rem;
    flex-wrap: wrap;
}

.site-nav a {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
    text-decoration: none;
    padding-bottom: 3px;
    border-bottom: 1px solid transparent;
    transition: color 0.3s ease, border-color 0.3s ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* =====================================================================
   Series card — the Code Crafting block as it appears on the front page
   ===================================================================== */

.series-card {
    padding: 3rem;
    background: linear-gradient(135deg, var(--highlight) 0%, var(--bg-secondary) 100%);
    border: 1px solid var(--border);
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 0 0 0 rgba(196, 40, 54, 0);
}

.series-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(196, 40, 54, 0.08);
}

.series-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: var(--accent);
}

.series-card h3 {
    font-family: 'Fraunces', serif;
    font-size: 2rem;
    font-weight: 400;
    margin-bottom: 1rem;
    color: var(--accent);
}

.series-card p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1rem;
    max-width: 68ch;
}

.series-card .series-count {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 1.5rem;
}

.series-card > a {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

.series-card > a:hover {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}

/* Row of spines/covers standing in for the volumes */
.cover-strip {
    display: flex;
    gap: 1.25rem;
    margin: 2.5rem 0;
    flex-wrap: wrap;
}

.cover-strip a {
    display: block;
    width: 132px;
    flex-shrink: 0;
    border: 1px solid var(--border);
    box-shadow: 0 10px 24px rgba(0,0,0,0.12);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
    background: var(--bg-secondary);
}

.cover-strip a:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 34px rgba(0,0,0,0.20);
}

.cover-strip img {
    width: 100%;
    height: auto;
    display: block;
}

@media (max-width: 768px) {
    .series-card {
        padding: 2rem 1.5rem;
    }

    .cover-strip {
        gap: 0.9rem;
    }

    .cover-strip a {
        width: calc(50% - 0.45rem);
    }
}

/* =====================================================================
   Series page — intro strip above the volumes
   ===================================================================== */

.series-intro {
    padding: 4rem 0 1rem;
    animation: fadeIn 1s ease-out 0.3s both;
}

.series-intro .intro-text {
    max-width: 68ch;
}

/* Links inside a diptych note pick up the same treatment as book links */
.diptych-note a {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    padding-bottom: 2px;
    transition: all 0.3s ease;
}

.diptych-note a:hover {
    color: var(--text-primary);
    border-bottom-color: var(--text-primary);
}